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io_uring: honor original task RLIMIT_FSIZE 

With the previous fixes for number of files open checking, I added some
debug code to see if we had other spots where we're checking rlimit()
against the async io-wq workers. The only one I found was file size
checking, which we should also honor.

During write and fallocate prep, store the max file size and override
that for the current ask if we're in io-wq worker context.

Cc: stable@vger.kernel.org # 5.1+
Signed-off-by: Jens Axboe <axboe@kernel.dk>
alistair/sensors
Jens Axboe 2020-03-20 11:23:41 -06:00
parent 60cf46ae60
commit 4ed734b0d0
1 changed files with 16 additions and 1 deletions
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17
fs/io_uring.c
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@ -604,7 +604,10 @@ struct io_kiocb {
struct list_head list;
unsigned int flags;
refcount_t refs;
struct task_struct *task;
union {
struct task_struct *task;
unsigned long fsize;
};
u64 user_data;
u32 result;
u32 sequence;
@ -2593,6 +2596,8 @@ static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe,
if (unlikely(!(req->file->f_mode & FMODE_WRITE)))
return -EBADF;
req->fsize = rlimit(RLIMIT_FSIZE);
/* either don't need iovec imported or already have it */
if (!req->io || req->flags & REQ_F_NEED_CLEANUP)
return 0;
@ -2662,10 +2667,17 @@ static int io_write(struct io_kiocb *req, bool force_nonblock)
}
kiocb->ki_flags |= IOCB_WRITE;
if (!force_nonblock)
current->signal->rlim[RLIMIT_FSIZE].rlim_cur = req->fsize;
if (req->file->f_op->write_iter)
ret2 = call_write_iter(req->file, kiocb, &iter);
else
ret2 = loop_rw_iter(WRITE, req->file, kiocb, &iter);
if (!force_nonblock)
current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
/*
* Raw bdev writes will -EOPNOTSUPP for IOCB_NOWAIT. Just
* retry them without IOCB_NOWAIT.
@ -2848,8 +2860,10 @@ static void __io_fallocate(struct io_kiocb *req)
{
int ret;
current->signal->rlim[RLIMIT_FSIZE].rlim_cur = req->fsize;
ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off,
req->sync.len);
current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
if (ret < 0)
req_set_fail_links(req);
io_cqring_add_event(req, ret);
@ -2875,6 +2889,7 @@ static int io_fallocate_prep(struct io_kiocb *req,
req->sync.off = READ_ONCE(sqe->off);
req->sync.len = READ_ONCE(sqe->addr);
req->sync.mode = READ_ONCE(sqe->len);
req->fsize = rlimit(RLIMIT_FSIZE);
return 0;
}